Bostrom had a recurrent character in 'Allo 'Allo!, first appearing mid-way through the second series and remaining until the show's finale. Officer Crabtree was played as an idiotic English undercover officer, disguised constantly as a Frenchgendarme during the Second World War. Much of the character's humour derived from his supposed inability to pronounce French words correctly in conversation, which, on an English-language television programme, was represented by ludicrous exaggeration and mispronunciation of ordinary English words. For example, "Good morning" would be pronounced as "Good moaning" and, famously, "I was just passing round the corner" would be "I was just pissing roond the corner". Bostrom actually speaks fluent French.[1] In 2005, Bostrom guest-starred in Dead Man Walking, an audio drama based on the television series Sapphire and Steel. Between December 2007 and January 2008, he continued his pantomime run when he appeared in a production as an ugly sister in Cinderella in Middlesbrough. On 8 January 2008, he appeared in an episode of Big Brother's Big Mouth on E4. He discussed events in the house after introducing the show in the familiar character of Officer Crabtree.